Re: [PATCH] gpio: pca953x: update irq_stat even when irq is not enabled (irq_mask not set).

[Bartosz Golaszewski <brgl@xxxxxxxx>]

On Sun, May 1, 2022 at 11:22 AM Puyou Lu <puyou.lu@xxxxxxxxx> wrote:
>
> From: Puyou Lu <lupuyou@xxxxxxxxxxxxx>
>
> When one port's input state get inverted (eg. from low to hight) after
> pca953x_irq_setup but before setting irq_mask (by some other driver such as
> "gpio-keys"), the next inversion of this port (eg. from hight to low) will not
> triggered any more (because irq_stat is not updated at the first time). Issue
> should be fixed after this commit.
>
> Signed-off-by: Puyou Lu <puyou.lu@xxxxxxxxx>
> ---
>  drivers/gpio/gpio-pca953x.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
> index d2fe76f3f34f..8726921a1129 100644
> --- a/drivers/gpio/gpio-pca953x.c
> +++ b/drivers/gpio/gpio-pca953x.c
> @@ -762,11 +762,11 @@ static bool pca953x_irq_pending(struct pca953x_chip *chip, unsigned long *pendin
>         bitmap_xor(cur_stat, new_stat, old_stat, gc->ngpio);
>         bitmap_and(trigger, cur_stat, chip->irq_mask, gc->ngpio);
>
> +       bitmap_copy(chip->irq_stat, new_stat, gc->ngpio);
> +
>         if (bitmap_empty(trigger, gc->ngpio))
>                 return false;
>
> -       bitmap_copy(chip->irq_stat, new_stat, gc->ngpio);
> -
>         bitmap_and(cur_stat, chip->irq_trig_fall, old_stat, gc->ngpio);
>         bitmap_and(old_stat, chip->irq_trig_raise, new_stat, gc->ngpio);
>         bitmap_or(new_stat, old_stat, cur_stat, gc->ngpio);
> --
> 2.17.1
>

This needs to Cc stable and a fixes tag.

Bart